Vibrator device



P. C. R-EBUT VIBRATOR DEVICE Oct. 17, 195 0 3 Sheets-Sheet 1 Filed July19, 1948 FIG.1.

Oct. 17, 1950 c, REBUT 2,526,414

VIBRATOR DEVICE Filed July 19, 1948 3 Sheets-Sheet 2 P. C. REBUTVIBRATOR DEVICE Oct. 17, 1950 3 Sheets-Sheet 3,

Filed July 19, 194a FIG .4.

Patented Oct. 17, 1950 1" VIBRATOR DEVICE Pierre Charles Rebut, Paris,France 5 Application July 19, 1948, Serial No. 39,545 In France August5, 1947 My present invention relates to improvements in vibrators andmore particularly vibrators adapted to produce high frequencyvibrations.

It is known that in conventional vibrators the production of. vibrationsis obtained through rotation of an eccentric mass. In practice, for thatpurpose,'unbalanced masses supported on pins mounted for rollingmovement in ball or roller bearings are used, or a rotatable cylindricalmass is arranged for rotation within a cylindrical housing, said massbeing in eccentric relationship with respect to said housing.

The last-mentioned arrangement has the advantage of being well adaptedto produce highfrequency vibrations as a result of the epicyclicmovement imparted to the rotary mass.

However, in apparatus of the above-mentioned type great difficulty hasbeen encountered by designers to produce apparatus having a high poweroutput. Due to secondary or side stresses generated by the movement ofthe bodies rotating at highspeeds, breaks frequently occur in theelements of the device.

It is an object of this invention to overcome thosedrawbacks. Theinvention make it pos sible to avoid the production of secondarystresses and the attendant break-down of the parts in motion. It thusmakes possible the construction of vibrators wherein the frequency ofvibration may reach values as high as several hundred thousandvvibrations per minute, and. which are adapted to develop a centrifugalforce in the order of tens or hundreds of tons.

Broadly stated, the invention as applied to vibrators of theabove-described type including a body of revolution eccentricallyarranged for rotation in and with respect toa recess formed as a volumeof revolution, consists of controlling the rotary body from a deviceattached at points externally related to the rolling circumferenceandprovided, with a certain amount of freedom between. the driving memberandthe rotary .body. This connection betweenv the driving. member andthe rotary mass'is accomplished in a non-rigid or yielding mannerthrough oscillatable or flexible links arranged on both sides of anintermediate plane of rotation and symmetrically with respect to saidplane.

. Sincethe connection for the control member driving therotary mass. iseffected at points externalto the rollingcircumference, the point ofconnection in its epicyclic movement'describes a curve-which will onlypresent small oscillations without any loops or cusps. Said point ofconnection is connected with a point of the drive 7 Claims. (01. 7487)-membe'r which describes a circumference. The

amount of freedom provided between the drive member and the point ofconnection therewith' makes it possible to allow for relative deviationsbetween the paths of travel of both said points The oscillations of thepoint of connection 'of Figure l is a diagrammatic illustration of thedrive for the eccentric rotary mass which clearly shows the principleused in producing said'drive.

Figure 2 is a transverse cross-section of a vi'- brator embodying saiddrive.

Figure 3 is a section'on the line IIIIII of- Fig. 2.

Figure 4 is a sideelevational view of the rotary portions of thevibrator as seen from the line IVIV of Fig. 2.

mass I!) being eccentrically arranged with re- Figure 5 is a partialcross-section on the line v v of Fig. 3. j I

Figure 6 is a cross-sectional view similar to Fig.5 but relating'to amodification. I

As shown, my improved vibrator essentially comprises a cylindrical massor body Hl having a diameter :1 adapted to roll within a fixed cylin-'drical recess l I having a diameter d-l-e, with the spect to the recessl l. 7

It is known that'as the mass I0 is rotated in the direction indicated bythe arrow, any given point thereof will'describe with respect to thehousing recess an epicycloid. I The epicycloids relating to thedifferent points of the mass will vary in shape according to theparticular point selected, and a few characteristic shapesare-indic'ated in dot-dash lines in Figure 1. For the points of thecircumference of contact between the mass [0 and the recess H, therelated epicy cloids are curves such as A having cusps. For

points inside said contactcircumference, the re'-' lated epicycloidsarecurves such as B having a plurality of loops. The center C of themass l0- describes a circumference of a radius correspond ing with thedegreeof eccentricity between the circumferences l0 and 'l I the rate atwhich said equal to twice the degree of eccentricity between.

I9 and I I, that is it is equal to e. But, the greater the spacing fromthe point under consideration to the contact circumference of II], thegreater will be the radius of curvature, and the lower,.

consequently, will be the accelerations of the point along its path oftravel, especially for those points located along the extension of theradius corre-.- j.

sponding to the point of contact.

-According to the invention, theeccentric r0.- tary'mass II! is drivenin rotation through a point I2 as far as possible away from its contactcircumference with the recess I I, and that point I2 is connected as at3 with the rotary drive member, centered on the center of the recess II,a certain amount of freedom being provided in the connection I4 betweenI2 and I3.

In this way, the point I3 which is centered concentrically with therecess I I describes a fixed circumference G, while the point ofconnection I2 follows the epicycloid F. Because of the freedom allowedin the connection I4 between the point I2 and the point I3, each ofthose points is free to follow its own path of travel. As shown in Fig.1, upon the point I3 of the drive member having reached I3 along thecircumference G, the point I2 will have attained I2 along the epicycloidF, the connection I4 having enabled the point I2 having reachedthe pointI2 to deviate more or less from the circumference G withoutopposing anyresistance thereto. Such relative deviations in the paths of travel willmerely result in corresponding oscillations for the connection I4 whichbeing non-rigid will not exert any dangerous stresses or strains.

It will then be possible without any inconvenience to impart a very highfrequency Of vibration to the mass III, as high'as several hundredthousand vibrations per minute. The resulting centrifugal force whichmay reach as much as several hundred tons will not result in a breakdownat any point of the apparatus.

In one exemplary embodiment shown in Figures 2 to 5, the eccentricrotary mass III is adapted to roll along the internal surface II of afixed annulus I la arranged on a wall I5 of the frame I 6 of the deviceand secured thereto through screws IT. The rotary mass I0 has securedthereto through screws I8 a pair of cylindrical side flanges I9supporting the element I2 through which rotation is imparted to the massI9. The flanges I9 are of a diameter substantially greater than that ofthe mass IIJ so that the driving element I2 is spaced from the contactcircumference of the mass III with the recess surface I I.

The frame I6 is closed at its sides with flanges carrying bearings 2I.The bearings 2I receive therein a shaft 22 driven from pulleys 23.Itwill be noted that the shaft 22 extends through the rotary mass II]but without contacting it, extending through a suitable aperture 24formed in said mass.

The shaft 22 has secured thereon a pair of carefully balanced arms 25through which the 4 flanges I9 and thereby the mass I0 is adapted to bedriven.

For that purpose each of the arms 25 carries at one of its ends aprojecting cylindrical finger I 3 secured thereto with a nut 26. Thecylindrical finger I3 engages a recess 2'! in the flange I9 with anaverage amount of circumference clearance or play sufiicient to allowfor the desired freedom in the connection. 1

In the flanges I9 there are further formed circular apertures 28 inwhich there is a weartaking member I2 press-fitted therein and securedthrough a key means 33, said wear-taking member forming the drive pointfor said flange. A rectangular recess 29 is furthermore formed in saidflange. Within the part I2 rigid with the flange I9, and also in thepart I3 rigid with the arm 25 suitable impressions or recesses 30 and SIare formed adapted to receive therein the respective ends of a pushermember I4 which provides for a free connection between the arms, Thepusher I I is dis- 25 and the flange I9. posed within the rectangularrecess 29 with an appropriate amount of clearance. The pusher I4 is heldin place by means of side plates or strips 32 suitably secured to theflange I9 as with screws.

On the arm 25 at the end thereof opposite to that supporting the fingerI3 a suitable balance member 33 is provided which extends into anappropriate recess 34 .in the flange I9.

The flanges I9 are laterally guided by means of projections 35 mountedon the wall I5 on the frame or alternatively on the arms 25. The frameI5 is adapted to be secured to an apparatus in conjunction with whichthe device of the invention is to be used, through a pair of boltsextending through suitable holes. The device may be cooled as through acirculation of com-. pressed or aspirated air.

As the shaft 22 is rotated under the action of the pulley 23 the arms 25are driven thereby.

Said arms through the medium of the fingers I3, pushers I4 and the partI2 cause rotation of the flanges I9 and consequently the rotary mass orbody ID. The latter under the action of centrife ugal force developedtherein will soon be applied" against the side walls of the cylindricalrecess II and will then roll therealong, each individual point of saidbody following an epicycloidal path with the arms 25 will be appliedthrough the medium of the pushers I4. Said points I3 follow a fixedcircumference (G as shown in Figjl). The relative deviations between thepaths of travel of I2 and I3 are. compensated for by'the oscillations ofthe pusher I4 which is freely movable within its housing 29. The drivethus is accomplished through a yielding of flexible connection. Ratherthan using a pusher such as I4 serving to drive the flanges I9 through athrust.

exerted on the part I2 of said flange, the connection from the arms 25to the flanges I9 may be accomplished (as shown in Fig. 6) through theuse of pull-rods or links 36, there being as shown two links 36 pivotedto the finger I3 rigid In this movement the connecting points.

It will be at those points I2 that the drive force tending to rotate thefingers I3 rigidj with the arms 25. The opposite ends of said links arepivoted on a pin 3 rigid with .the flanges l9 thus replacing thewear-member H of the embodiment shown in Fig. 2.

Rather than using rigid elements I4 or 36 as shown the connection fromthe arms to the flanges I9 may be obtained through any suitableresilient or flexible yielding means providing the requisite freedom ofmotion to compensate for the relative deviations in the trajectories ofthe points of the drive member, i. e. arm 25, and

those of the rotary body ll] (Fig. 2).

It will of course be understood that the specific outside of theperiphery of said opening in the frame for imparting rotary motion ofthe drive shaft to said mass.

2. A vibrator comprising a frame having a cylindrical opening, acylindrical rotating mass positioned in said opening for rollingmovement on the inner surface of said opening with its axis parallel tothe axis of the opening, a drive shaft passing through the center ofsaid opening and eccentrically through an opening in the center of saidmass, lateral flanges carried by said mass, arms carried by said shaft,and means positioned exteriorly of the periphery of said opening in theframe interconnecting the flanges and arms.

3. A vibrator comprising a frame having a cylindrical opening, acylindrical rotating mass positioned in said opening for rollingmovement onthe inner surface of said opening with its axis parallel tothe axis of the'opening, a drive shaft passing through the center ofsaid opening and eccentrically through an opening in the center of saidmass, lateral flanges carried by said mass, arms carried by said shaft,said flanges having elongated non-radial recesses provided thereinoutside the periphery of said opening in the frame, pusher elementsfreelymounted in said recesses, an abutment in each recess engaged byone end of the pushers, and fingers carried by said arms engaging theother end of said pushers for transmitting rotation from the shaft tothe mass.

4. A vibrator comprising a frame having a cylindrical opening, acylindrical rotating mass positioned in said opening for rollingmovement on the inner surface of said opening with its axis parallel tothe axis of the opening, a drive shaft passing through the center ofsaid opening and eccentrically through an opening in the center of saidmass, lateral flanges carried by said mass,

I. file of this patent:

arms carried by said shaft, and links positioned outside of theperiphery of said frame opening for inter-connecting the ends of thearms with the outer portions of said flanges.

5. In a vibrator, a frame having a cylindrical opening, a rotating massadapted to roll on the inner surface of said cylindrical opening withits axis parallel to the axis of said opening, lateral flanges carriedby said mass for driving the same, a driving shaft mounted on said frameand having an arm, and non-rigid means connecting said arm to thelateral flanges of the rotating mass.

6; In a vibrator, a frame having a cylindrical opening therein, arotating mass adapted to roll on the inner surface of said cylindricalopening with its axis of rotation parallel to the axis of said opening,lateral flanges carried by said mass for driving the same, a drive shaftmounted on said frame, arms carried by said shaft, and freely movablepusher elements connecting the ends of said arms with said flanges fortransmitting rotary movement from the arms to the flanges.

7. In a vibrator, a frame having a cylindrical opening, a rotating massadapted to roll on the inner cylindrical surface of said opening withits axis of rotation parallel to the axis of the opening, lateralflanges carried by said mass for ef-' fecting its rotation, a driveshaft mounted in the frame, arms carried by the drive shaft, and linksinterconnecting the ends of the arms with said 5 flanges fortransmitting rotary movement of the shaft to said rotating element. a

PIERRE CHARLES REBUT.

' REFERENCES CITED The following references are of record in the UNITEDSTATES PATENTS

